Most Indian energy companies bought stakes in overseas coal assets in 2010-2011 period when global coal prices were at a peak of $135 a tonne
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/rise-imported-coal-prices-puts-overseas-coal-mines-back-focus
[2] http://admin.indiaenvironmentportal.org.in/category/author/amritha-pillay
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-standard-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mining
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/coal
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/power-industry
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/china
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/thermal-power-plants